Camera focusing attachment



IN V EN TOR.

RUDOLPH CHETTEVI LLE www ATTORNEY Patented July 3, 1928.

ICE.

`RUDOLPH CHETTEVILLE; OF NEW' YORK, N. Y;

CAMERA FocUsn-IG ATTACHMENT.

Appiicatiq ined April Y 15,

rThe invention relates in general toa focus'- ingl attachmentfor acamera of the type of such devices which include a ground glass forreceiving the inverted image, a reflector for reverting the position ofthe'image and a collapsible hood provided with a sight opening forinspecting the image in the reflecltor while vshutting ofi' outsidelight.

lThe primary object ofthe invention is to provide a simplified form ofattachment of the type outlined which will be formedof a minimumv,number of structural parts, in which the sight openinglcontaining:part of. the, collapsible hood will be held stretched undertension, in which the'y collapsible parts Vare designedto be containedwithin the attachment when ,closed and in which the Collapsible hood isautomatically dist-ended into operative position under spring ytensionwhen the parts are locked, collapsed position.

Another object ofthe invention is to yprovide an attachment of the typeoutlined which can be adjustably positioned on Athe carriera casing sothat the sight opening will be extendedfupwardly or in any other desireddirection when the camera is in its normalupright position or when anyof its other sides are positioned face upward.

Various other objects and advantages of theinventioii willA be in partobvious from an inspection of the accompanying drawings and' in' part'will be more fully set forth in the following particular description ofone orin ofmechanism embodying my inventiOJl', and the' invention alsoconsists in certain new and novel features of constructionandcombination'cof parts hereinafterset' forth l and claimed. y y K Inthe accompanying drawing:

Fig; 1 isv a' view side' elevation ofa camera equipped'jwithA apreferred embodiment' ofthe invention shown in` closed position and withparts broken away to show internalconstruction; Y. v Y

Fig; 2 yi's a view in side elevation of the attachment shown in Fig. 1with the hood in distended position andwith parts broken away toshowinternal construction; and

Fig. 3 isa view in rear elevation of the structure' ,shownv in Fig.' 2yand withparts broken away vtoV showy internal construction Intheqdrawing and referring'particularly Fig'. 1 there is illustrated aconventional forni ofI camera casing except. that' the rear open end 11'is provided at topy and released from their` 1927.kk semi No. 184,170.

bot-tom with a pair of inwardly facing grooves 12 opened at oppositeends and adapted to receive the attachment 12 particularly 'constitutingthe novel element of this invention and permitting the mounting thereof'in a plurality of positions.

The attachment 12 comprises a. main supporting frame 13 in which isfitted a. ground glass 14 and for this reason this frame will beYreferred to hereinafter as the ground glass frame. The side of theground glass frame which is designed to lit against the openend 11 ofthecasing 10 is square in elevation and is provided on its four sides withoutwardly extending tongues 15. Either pair of opposing tongues aredesigned to have a sliding fit in the groove 12 and in this way the.attachment as a whole may be mounted in the'caniera casing in either oftwo'positions, one at right angles to the other. Y y

The attachment includes an outwardly and downwardly swinging frame 16mounted on the inner face of which is. amirror 17 and for this reasonthe frame 16 will be referred to hereinafter as a reflector frame.Loosely hung to depend` from the upper partof the ground glass frame isa flat, rigid, still'ening member 18 which dueto the fact that it formsaV collapsible part of the hood hereinafter more fully described, willbe referred to hereinafter asl a hood frame 18. Extendinv between theground glass frame and the rehecto'r frame and also extending betweenthe hood frame and the reflector frame are collapsible sides .19 whichcoact with the frames to form a hood designed to be folded within theoutlines of the frames 13 and 16 when in the collapsed position shown inFig. 1. The collapsible hood also includes a top part 19 designed tolcoact with the' hood frame' 18 to extend above the rearwardlyhorizontally projected outline of the camera when'lin the distendedposition kshown in Fig. 2. The top part 19 of the hood is provided witha sight opening 20, one side of which is outlined by -tlie free edge 21of the hood frame.v The sight opening is proportioned so as to permitthe user to see the image in the mirror 17; and at ythe same time inorder to minimize the possibility of light leakage into the hood thesight opening is made of theleast possible area to accommodate the eyesof the usen* The hood frame is elevated from the collapsedposition'shown in Fig. 1 into the dislili:

tended position shown in Fig. 2 and the retlector frame is kicked intoits open position shown in Fig. 2 and the hood distended upwardly bymeans ora spring 21 bearing.V e on Vthe inner or under side or the hoodtrame v18. The spring 21 is an endless-wire asparlti'cularly shown inFig. 3, the middle porftion or which is bent into a U-shaped bearingmember 22 and the end portions of which are coiled in oppositedirections about a spring guide rod23 to form oppositely disposed coiledspring sections24 and 25. Y The ends 26 oi the spring are broughttowards each other and are'receivedin a centrally positioned slot 27lformed on the inner tace tended position asl shown in Fig. 2 by means ofa knuckle hinge joint 31 as is usual in such constructions.k Thereflector trame 16 is locked invitscollapsed position shown in Fig. 1 bymeans or a spring pressed latch Y. 32`carried`by the frame 13 andextending into a recess 33 atthe top edge 311 of the frame 16. The latch32 is released and moved into unlocked position against the tension ofthe spring 33 by means of a single nger actu-` ated lever 34 projectingabove the trame 13.

In operation andV assuming that lthe parts are in the collapsed positionshown in Fig. 1,

the operator by pressing on the lever 34 re-` leases the reflectorframe. At .thistirnethe e spring 21 as shown in Fig. 1 is under tensionand bears forcefully against the adjacent side of the hood frame 18whichv in turn bears against the reflector` frame 16 and acts toVproject the same downwardly and outwardly into the position shown inFig. 2. As the reflector frame 16 moves out of the path ci the upwardlyswinging hood frame 18 this hood frame is Vtree to swing from thedepending position in Fig. 1 into the upwardly extending position shownin Figs. 2 and 3.

jThe movement of the trames 16 and 18 in opposite directions Adistendsthe collapsible sides and elevates the. sight opening` into position tobe Vconveniently available tothe operator. The tension of the springwill be usually suliicient tomove the locking means 31 into theelongated, operative position shown in Fig. 2 but in'y case this'lockingmeans does not so move into fixed position the operator can easily littthe jointed part into the fully locked position shown inF ig. l

2. The construction can'then` be used to y structures.

the part or the hood containing the sight focus the images as is usualinthe Yoperation or such devices. Y

" When it is desired to collapse the structure from the position shownin Fig. 2 into the position shown in Fig. 1 the locking means 31 is'manually V released by breaking the joint and pressing' down uponV theupwardly ex posed side of the hood frame. It can be moved from theposition shown in F ig..2 towardsV the position shown in'Fig;Y 1 anduntil the free edge 21has been swung past a position extending at rightangles to the frame 16. `Manual pressure on theframe 18 vcan then bereleased and frame 16 elevated into its fully closed positionVwhile"elevatingv the latch 32. Releasing pressure'l onV theA lever 311`permits the latch to move into lock-y ing position and the constructionis restored to the closed condition shown in Fig.` 1.

` Should it be desired to turnth'e cameraf on either side or to resetthe sightopening to extend Vfrom any desired side of theV camera, theattachment 'may be withdrawnV by engaging the frame 13, turning the samedegrees and resetting it into engagement withl the grooves' on the'camera' casing.V- In this waypthe sight opening'in'ay bepositioned toentend in any direction irrespec-` tive as to'what side of the cameramay be.

facing upwardly.

By means of the device disclosedit is pos-1 sible toprovide acollapsible, tocnsinghood' which will automatically spring open 'into anoperative position simply by releasing the latch which Vholds thereflector frame in its normally closed position. Thelporti'on ot thehood which contains the sight opening is held rigidly in position tovprevent accidental contractionl of the sightropening and Vat the sametime there has been avoided theneces? sity of providing a separate sightopening containing part. distinct fromthe foldable lul? part ofthe hoodas characterizes known The reflector frame as well Vas vopening isprojected into operativeposition by the use of a single spring whichwhen the device is closed bears on theparts at points remote from theirpivotal connections'thus minimizing strains ,on they pivotal kconnections but permitting the spring to exert its Y maximum distendingeil'ect when the holding latch is released. Y

Having thus described my invention, 'I claim:l i Y' j.' '4

1. A camera attachmenty comprising a ground glass frame, a reliectorframe', Vmeans hingedly connecting the bottom edges of said trames, ahood frame hingedly connected to the upper edge of the Vgroundglass'frame, collapsible sides connecting the adjacent Vedges ofthereflector frame and the hoodV frame and coacting therewithto form aVcollapsiblehoodhaving` a sight Y'opening and said rhood frame mountedfor swinging movement from a position extending upwardly from the groundglass frame when the hood is distended into a depending positioncontained within the hood when the hood is collapsed, a spring betweenthe ground glass frame and the hood frame and tending to swing the hoodframe from its depending into its upstanding position and thus tendingto distend the hood and releasable means for securing the reflectorframe to the ground glass frame and thus secure the hood in collapsedposition against the opening` tension of said spring.

2. A camera attachment comprising a ground glass frame, a reflectorframe, means hingedly connecting the bottom edges of said frames, a hoodframe hingedly connected to the upper edge of the ground glass frame,collapsible sides' connecting the adjacent edges of thereflector frameand the hood frame and coacting therewith to form a collapsible hoodhaving a sight opening and said hood frame mounted for swinging movementfrom a position extending upwardly from the ground glass frame when thehood is distended into Ia depending position contained within the hoodwhen the hood is collapsed and a spring between the ground glass frameand the hood frame and tending to swing the hood frame from its Idepending into its upstanding position -and thus tending to distend thehood.

3. In a camera, the combination of a ground glass frame, a reflectorframe and ya hood frame both hingedly connected thereto, collapsiblesides between the free frames and coacting therewith to provide acollapsible hood, spring controlled means for moving the hood frame andwith it the entire hood into a distended position and means between thereflector and ground glass frames for locking the hood in distendedposition.

4. In a camera, the combination of a ground glass frame, a reflectorframe and a hood frame both hingedly connected thereto, collapsiblesides between the three frames and coacting therewith to provide acollapsible hood and spring controlled means for moving the hood frameand with it the entire hood into a distended position.

5. In a camera, the combination of a ground glass frame, a reflectorframe, collapsible sides connecting the frames and coacting therewith toprovide a hood, a spring guide rod carried by the ground glass frame anda spring coiled on said rod bearing on the reflector frame and tendingwhen free of restraint to move the hood into distended position.

6. In a camera, the combination of a ground glass frame, a refiectorframe, collapsible sides connecting the frames and coacting therewith toprovide a hood, a spring guide rod carried by the ground glass frame, aspring coiled on said rod, bearing on the reflector frame and tendingwhen free of restraint to move the hood into distended position and acatch between the frame for securing the hood in closed position withsaid spring under tension.

Signed at New York in the county of New York and State of New York this14th day of April A. D. 1927.

RUDOLPH CHETTEVILLE.

